Yarn guides for warp knitting machines

ABSTRACT

There are provided yarn guides for warp knitting machines imbedded into a holder the longitudinal axes of said guides lie in a common plane. The heads of said guides which contain the eyelets thru which the thread passes are bisected by said axes and also by said common plane to which the heads subtend an angle of about 30* to 45*. The effect of such angling of the heads is to reduce thread breakage due to thread abrasion.

United States Patent 1 1 Kohl [ July 22, 1975 1 YARN GUIDES FOR WARP KNITTING MACHINES [76] Inventor: Karl Kohl, 1O Chlorodont Strasse,

Obertshausen, Germany, 6053 [22] Filed: Apr. 16, 1973 [21] Appl. No.: 351,731

130,564 5/1902 Germany 903,447 8/1962 United Kingdom 66/86 R 715,539 10/1966 ltaly 66/125 Primary Examiner-W. C. Reynolds Assistant ExaminerAndrew M. Falik Attorney, Agent, or FirmOmri M. Behr [57] ABSTRACT There are provided yarn guides for warp knitting machines imbedded into a holder the longitudinal axes of said guides lie in a common plane. The heads of said guides which contain the eyelets thru which the thread passes are bisected by said axes and also by said common plane to which the heads subtend an angle of about 30 to 45. The effect of such angling of the heads is to reduce thread breakage due to thread abrasion.

4 Claims, 5 Drawing Figures '1- YARN GUIDES i 'Q'R' WARPKNITTING MAcHiNEs BACKGROUND or THE INVENTION];

It is the general'cust'om in the artto cast yarn guides into holders wherein the feet of the guides are cast into an alloy suitably of tin and antimony. These holders are then removably affixed to the warp knitting machine. The entire-set of-guide holders, each of which are ap proximately one inch wide. areset side-by-side into the machine to form an entire bed of guides. It is conven tional to set the guides into the casting so that the plane of the individual guide is perpendicular to the plane of the-bed and an axis drawn through the holes in the guide heads is parallel to the general plane of the guide bed. Thus, equally, the general plane of the guide head is perpendicular to the common plane of the yarn guide bed. The consequencethereof is that the threads when entering and leaving the eye in the head of the guide subtend a very acute angle thereto. Such a highly acute angle is connected with a substantial abrasion of the thread and also according to the type of thread material used, occasionally also the eyelet material.

It has been attempted to solve this problem by rotating the guides by 90. that is to say, so that the heads of the guides lie in a common plane parallel to the general plane of the yarn guide bed. Unfortunately, this approach does not lead to satisfactory results since because there must still be space between the individual guides to permit the passage therebetween of the latch needles or bearded needles. This approach may only be utilized when an abnormally large separation between the yarn guides is permissible. Hence, this solution is only practical for the production of a highly restricted group of specialized goods.

It would thus be desirable to provide a method of substantially lowering the high thread abrasion without necessitating extraordinary equipment.

SUMMARY OF THE INVENTION In the novel mounted yarn guides of the present invention. the guide heads are mounted to subtend an angle of between and to the plane of the bed. Utilizing this modification, the equipment may be run with substantially the same swing cycle of the guidebar beds as heretofore permitting the beds to move in the same or substantially the same direction. It is the surprising finding of this present invention that under these circumstances it is possible to lower the thread abrasion even with comparatively narrow spaces between the guides.

In certain machines the yarn guide beds either do not move or merely swing during part of the cycle. In this type of machine the bearded or latch needles either perform the entire swinging cycle or perform it partially. In this modified use of the machine the plane of swing of the latch needles or beard needles is altered in the appropriate manner.

DESCRIPTION OF THE DRAWINGS FIG. I is a plan view ofa guide unit wherein the shaft and the head of the guides subtend an angle of between 30 and 45 to the principal plane of the mounting unit.

FIG. 2 shows a modification of the unit of FIG. 1 wherein the head of the yarn guide is at an angle of 30 to 45 to the principal plane of the mounting unit and the plane of the shaft thereof is perpendicular to said plane.

FIG. 3 shows a plan view of a further modification of the unit of FIG, 1 wherein the yarn guide head is at an angle of 3045 to the principal plane of the holder DESCRIPTION OF THE PREFERRED EMBODIMENTS It is the common characteristic of the guide ,iun its of the present invention that the headsl3 of the'individ- -ual guides 10 having eyelets'l4 t ereifijspbead an angle of between about 30 to about 45 to the general plane of the mounting unit 1, namely AAAA.

In the embodiment of FIG. I the head 13 and the shaft 12 lie in a common plane. However, it is within the purview of the invention that so long as the plane of the head 12 subtends an angle within the aforementioned range with the principal plane AAAA of the mounting unit the shaft 12 may be perpendicular or parallel to said plane. Principal plane AAAA may be conveniently defined as an imaginary plane passing through the body of mounting unit I and running parallel to the common plane defined by the longitudinal axes of the shafts 12. The principal plane AAAA may also be defined as a plane passing through transverse axis A and through the locus of the eyelets l4 and at the same time, running parallel to the plane of longitudinal axes of the shafts 12. Such modifications as illustrated in FIGS. 2 and 3, of course, contemplate a twist in the portion of the guide lying between head 13 and shaft 12.

For example, FIG. 2 discloses a modification of the unit in FIG. 1 in which the flat portion of the shafts 12 are perpendicular to the principal plane AAAA. The heads 13 of the guides shown in FIG. 2 are disposed at an angle of 30 to 45 with respect to principal plane AAAA. Essentially, the same effect may be obtained in the manner disclosed in FIG. 3 by placing the flat portions of the shafts 12 in a common plane parallel to or lying in principal plane AAAA. The heads 13 of the guides are then twisted with respect to the shafts 12, so as to subtend an angle of 30 to 45 with respect to principal plane AAAA. In both FIGS. 2 and 3, the heads 13 subtend the same angles with respect to principal plane AAAA, but the shafts 12 are disposed at with respect to the two different embodiments.

The embodiment of FIG. 4 is the same as that shown in FIG. 1 from perspective 4. In this isometric-type view, the guides are seen from an angle perpendicular to the flat portion of shaft 12 and therefore the perspective of the mounting block 1 corresponds to the angle of canting between the guides and the mounting unit 1.

FIG. 5 shows the path of travel BB of a bearded or latch needle between the guides of the modification of FIG. 1. As stated heretofore it is immaterial whether guide bed swings or the needle swings or whether both do.

FIG. 5 also shows the transverse axis A. The transverse axis is an arbitrary line proximate to the mounting hole 16 passing thru the mounting unit parallel to the plane of the face 17 thereof when the guides are mounted. When the unit is mounted in the guide bed (not shown) of the machine the transverse axis will be parallel to the longitudinal axis of the said bed.

I claim: 1. A yarn guide unit for a warp knitting machine comprising a mounting unit, said mounting unit having a transverse axis, and a plurality of yarn guides each guide comprising a shaft portion having a longitudinal axis and a substantially flat head portion attached to said shaft portion, said head portion having an eyelet therethrough and being bisected by said longitudinal axis. said longitudinal shaft axis being perpendicular to said transverse mounting unit axis, said guide shafts being mounted side by side in said mounting unit and the longitudinal axes of said shafts lying upon a common principal plane, said principal plane also passing thru said transverse axis and the center of said eyelet wherein each of said head portions subtending an angle of between about 30 to about 45 to said principal plane which bisects said head portions.

2. a yarn guide unit in accordance with claim 1 wherein the shaft portion is substantially flat and the head portion and the shaft portion of each guide lie in a common plane.

3. A yarn guide unit in accordance with claim 1 wherein the shaft portion of each guide is substantially flat and lies parallel to the principle plane.

4. A yarn guide unit in accordance with claim 1 wherein the shaft portion of each guide is substantially flat and lies perpendicular to the principle plane. 

1. cA yarn guide unit for a warp knitting machine comprising a mounting unit, said mounting unit having a transverse axis, and a plurality of yarn guides each guide comprising a shaft portion having a longitudinal axis and a substantially flat head portion attached to said shaft portion, said head portion having an eyelet therethrough and being bisected by said longitudinal axis, said longitudinal shaft axis being perpendicular to said transverse mounting unit axis, said guide shafts being mounted side by side in said mounting unit and the longitudinal axes of said shafts lying upon a common principal plane, said principal plane also passing thru said transverse axis and the center of said eyelet wherein each of said head portions subtending an angle of between about 30* to about 45* to said principal plane which bisects said head portions.
 2. a yarn guide unit in accordance with claim 1 wherein the shaft portion is substantially flat and the head portion and the shaft portion of each guide lie in a common plane.
 3. A yarn guide unit in accordance with claim 1 wherein the shaft portion of each guide is substantially flat and lies parallel to the principle plane.
 4. A yarn guide unit in accordance with claim 1 wherein the shaft portion of each guide is substantially flat and lies perpendicular to the principle plane. 